:root {
  --graphite: #353535;
  --stormy-teal: #3c6e71;
  --dark-teal: #00555d;
  --charcoal: #565656;
  --espresso: #632828;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--graphite);
  color: #ffffff;
  line-height: 1.6;
}

header {
  background-color: var(--dark-teal);
  color: #ffffff;
  padding: 1rem 2rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

header h1 {
  font-size: 1.5rem;
}

header a {
  color: #ffffff;
  text-decoration: none;
  margin-left: 1.5rem;
  transition: color 0.3s;
}

header a:hover {
  color: var(--stormy-teal);
}

main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.container {
  background: var(--charcoal);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

h1, h2, h3 {
  color: #ffffff;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  background-color: var(--stormy-teal);
  color: #ffffff;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s, transform 0.1s;
}

.btn:hover {
  background-color: var(--dark-teal);
  transform: translateY(-1px);
}

.btn-primary {
  background-color: var(--stormy-teal);
}

.btn-danger {
  background-color: var(--espresso);
  color: white;
}

.btn-secondary {
  background-color: var(--dark-teal);
  color: #ffffff;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #ffffff;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid var(--graphite);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--graphite);
  color: #ffffff;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--stormy-teal);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
}

.error {
  background-color: var(--espresso);
  color: #ffffff;
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.success {
  background-color: var(--dark-teal);
  color: #ffffff;
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

table th,
table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--graphite);
  color: #ffffff;
}

table th {
  background-color: var(--dark-teal);
  color: #ffffff;
  font-weight: 600;
}

table tr:hover {
  background-color: var(--charcoal);
}

.card {
  background: var(--charcoal);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  margin-bottom: 1.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.card h3 {
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat-card {
  background: var(--dark-teal);
  color: #ffffff;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
}

.stat-card h2 {
  color: var(--stormy-teal);
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.stat-card p {
  font-size: 1.1rem;
}

.question-block {
  background: var(--graphite);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--stormy-teal);
}

.question-block h4 {
  color: #ffffff;
  margin-bottom: 1rem;
}

.option-list {
  list-style: none;
}

.option-list li {
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--charcoal);
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
  border: 1px solid transparent;
}

.option-list li:hover {
  background-color: var(--dark-teal);
  border-color: var(--stormy-teal);
}

.option-list input[type="radio"] {
  margin-right: 0.5rem;
}

.option-list label {
  color: #ffffff;
  cursor: pointer;
  display: block;
}

.timer {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--espresso);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  font-size: 1.2rem;
  font-weight: bold;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  z-index: 1000;
}

.question-progress {
  background: var(--dark-teal);
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 600;
  color: #ffffff;
}

.navigation-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.welcome-box {
  text-align: center;
  padding: 3rem 2rem;
}

.welcome-box h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.welcome-box p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  header nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .timer {
    position: static;
    margin-bottom: 1rem;
  }
}